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We examined pp60c-src protein kinase activity in human gastric carcinoma cell lines and gastric carcinoma tissues as well as normal mucosa. pp60c-src kinase activity was detected in all 5 carcinoma cell lines at various levels. Of 16 gastric carcinoma tissues, 8 showed higher pp60c-src kinase activity in tumor tissues than in corresponding normal mucosa. However, the levels of expression of pp60c-src detected by Western blotting were not always consistent with the activities of pp60c-src protein kinase. These findings suggest that the increase in pp60c-src protein kinase activity might be brought about by post-translational changes.
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